windshield replacement

[AdamIsAdam]

I want to get the Cobra Valley windshield for my FFR MKIV. I'm confused about how to precisely measure the existing windshield that's currently installed on the car. Do I measure just the glass, inside the frame? I assume I lay a tape measure along the glass. But their measurement page also talks about a broom handle/straight edge. So that confused me.

I measured 12 5/6" top to bottom inside center.
Top across inside to inside along glass is 45.5"
Bottom across inside to inside along glass is 49.75"

I'll go back out and verify these numbers. But if correct, is that simply their Type 1 product?

(EDIT: I measured again. It's hard to get an exact measurement with a tape measure (two people). I may use string. These measurements all need 1/4" added to them to account for glass being set into the frame per their site. I wonder how precise these measurements have to be or is their some wiggle room inside of the frame... or do they just make all Type 1 windshields the same.)

TIA,